8benzoyl 1,2,3,4 tetrahydroquinoline

ABSTRACT

1,2 - DIHYDRO - 8 - PHENYL - 3H PYRIDO(3,2,1-JK)(1,4)BENZODIAZEPIN-5(6H)-ONES, PROCESS FOR PREPARING THE SAME AND INTERMEDIATES PREPARED BY SAID PROCESSES. THE NOVEL COMPOUNDS OF THIS INVENTION EXHIBIT TRANQUILIZING AND ANTICONVULSANT ACTIVITY IN ANIMALS.

Patented Feb. 19, 1974 3,793,328 8 BENZOYL 1,2,3,4 TETRAHYDROQUINOLINE Jackson B. Hester, Jr., Portage, Mich., assignor to The Upjohn Company, Kalamazoo, Mich. No Drawing. Original application Nov. 3, 1969, Ser. No. 873,719, now Patent No. 3,714,149, dated Jan. 30, 1973. Divided and this application Feb. 8, 1971, Ser.

Int. Cl. C07d 33/10 US. Cl. 260-286 R 1 Claim ABSTRACT OF THE DISCLOSURE 1,2 dihydro 8 phenyl 3H pyrido[3,-2,1-jk] [1,4]- benzodiazepin-S(6H)-ones, processes for preparing the same and intermediates prepared by said processes. The novel compounds of this invention exhibit tranquilizing and anticonvulsant activity in animals.

This is a division of application Ser. No. 873,719, filed Nov. 3, 1969, now issued as US. Pat. No. 3,714,149.

BRIEF SUMMARY OF THE INVENTION This invention relates to novel 1,2-dihydro-8-phenyl- 3H-pyrido[3,2,1-jk] [1,4]benzodiazepin-5 (6H)-ones, processes for preparing the same and intermediates prepared by said processes. The novel 1,2-dihydro-8-p'henyl-3H- pyrido[3,2,1-jk] [1,4] benzodiazepin-5(6H) -ones of the invention have the formula formula in O Q wherein R is the same as above and R is selected from the group consisting of hydrogen, acetyl and bromoacetyl.

The novel compounds of the invention can be prepared by the process represented by the following equations:

HNO: ZDIHOAC Step 1 Step 2 H NO III IV l NH;

O R C OHS-CHI J CH3 NalDt Step 4 2)]519304 Step 3 \T R q i0 Step 5 Ila O R l Bb-CHr- -B \N Step 6 I L H IIb R q NHz/MeOH R Step 7 L 5:0 =o

IIc

wherein R is the same as above.

3 DETAILED DESCRIPTION Step 1 of the above process is carried out by treating a solution of the appropriate 1,2,3,4-tetrahydroquinoline (III) in dilute aqueous sulfuric acid with an aqueous solution of sodium nitrite. Step 2 is carried out by treating a stirred mixture of the 1-nitroso-1,2,3,4-tetrahydroquinoline (IV), methanol and zinc dust with acetic acid to yield V. Step 3 involves refluxing a solution of the l-amino- 1,2,3,4-tetrahydroquinoline (V), phenylacetone and acetic acid in benzene with azeotropic distillation of water, concentrating the resulting solution and heating the residue in 2M ethanolic sulfuric acid to yield a 5,6-dihydro-2-methyl- 1-phenyl-4H-pyrrolo[3,2,l-ij]quinoline (VI). The conditions utilized in these three steps are described in considerable detail by Kost et al., J. Gen. Chem., 29, 1920 and 3937 (1959).

In step 4, a stirred mixture of the 5,6-dihydro-2-methyl- 1-phenyl-4H-pyrrolo [3,2,1-ij]quinoline (VI), water, dioxane and sodium metaperiodate is kept at 50-70 C. for 18-36 hours. The mixture is then poured into water and the product extracted with a suitable organic solvent such as methylene chloride, chloroform or ether to give a 1- acetyl-8-benzoyl-1,2,3,4-tetrahydroquinoline (IIa) In step 5, a mixture of Ha, 6 N hydrochloric acid and ethanol is refluxed for 10-24 hours to yield an 8-benzoy1- 1,2,3,4-tetrahydroquinoline (IIb In step 6, a solution of IIb and an acid acceptor such as pyridine or triethylamine in benzene or ether is treated at ambient temperature with bromoacetyl bromide and allowed to stand for 1-5 hours to give an 8-benzoyl-1- bromoacetyl-1,2,3,4-tetrahydroquinoline (IIc) In step 7, He is dissolved in a solution of anhydrous ammonia in methanol. This solution is allowed to stand at about 25 C. for 5-18 hours to yield a 1,2-dihydro-8- phenyl-3H pyrido-[3.2,1-jk] [1,4]benzodiazepin 5 (6H)- one (1). The product is recovered from the reaction mixture by conventional procedures such as crystallization, evaporation, chromatography and combinations thereof.

In step 8, a solution of Hb and ethyl glycinate hydrochloride in dry pyridine is refluxed for 8-24 hours. During the first few hours of the reaction the ethanol-water-pyridine azeotrope is slowly distilled from the mixture. The product (1) is recovered from the reaction mixture by conventional procedures such as crystallization, evaporation, chromatography and combinations thereof.

The acid addition salts of the invention comprise the salts of the compounds of 'Formula I and the compounds of Formula II wherein R is hydrogen with pharmacologically acceptable acids such as sulfuric, hydrochloric, nitric, phosphoric, lactic, benzoic, methanesulfonic, p-toluenesulfonic, salicyclic, acetic, propionic, maleic, malic, tartaric, citric, cyclohexanesulfamic, succinic, nicotinic, ascorbic acids, and the like.

The novel compounds and intermediates of this invention exhibit tranquilizing and anticonvulsant activity. These activities were evaluated by use of the following tests.

Chimney test [Med. Exp. 4, 11 (1961)] 1 This test determines the ability of mice to back up and out of a vertical glass cylinder within 30 seconds. Failure of mice to back up and out within this time indicates tranquilization.

Dish test Mice in Petri dishes cm. diameter, 5 cm. high, partially embedded in wood shavings) climb out in a very short time, when not treated. Mice remaining in the dish for more than 3 minutes indicates tranquilization.

Pedestal test Mouse is placed on a pedestal. The untreated mouse leaves the pedestal in less than a minute to climb back to the floor of the standard mouse box. Tranquilized mice will stay more than 1 minute.

Nicotine antagonism test Thirty minutes after mice in a group are treated with the test compound, both the treated and untreated mice are injected with 2 mg./kg. of nicotine salicylate. The untreated mice show overstimulation, i.e., (1) running convulsions followed by (2) tonic extensor fits, followed by (3) death. An effective nicotine antagonist will protect the treated mice against (2) and (3).

The results of the above tests utilizing some of the novel compounds of this invention (administered intraperitoneally) are set forth in the following table. The results are expressed in terms of the mg./kg. dosage at which the tested compounds exhibited the activity in 50% of the mice (ED5o).

1 N.A.=Nieotine antagonism. i TE=Tonic extensor tits. 8 D=Death.

For purposes of administration to birds and to mammals, including animals of economic value such as horses, cattle, sheep, pigs, mice, rats, rabbits and the like, the novel compounds of the invention can be combined with solid or liquid pharmaceutical carriers and formulated in the form of tablets, powder packets, capsules and the like solid dosage forms, using starch and like excipients, or dissolved in suitable solvents or vehicles for oral or parenteral administration.

Also, for mammals and birds food premixes, with starch, oatmeal, dried fishmeat, rishmeal, flour and the like can be prepared.

The novel compounds of this invention having the Formula I and the Formula H wherein R is hydrogen also form thiocyanic acid addition salts which when condensed with formaldehyde, form resinous materials useful as pickling inhibitors according to U.S. Pats. 2,425,320 and 2,606,155. The fluosilicic acid addition salts are useful as mothproofing agents according to U.S. Pats. 1,915,334 and 2,075,359.

The following examples are set forth to illustrate my invention and to enable persons skilled in the art to better understand and practice the invention and are not intended to limit the same.

EXAMPLE 1 l-acetyl-S-benzoyl-1,2,3,4-tetrahydroquinoline A stirred mixture of 49.4 gm. (0.20 mole) of 5,6-dihydro-2 methyl-1-phenyl-4H-pyrrolo[3,2,1-ij]quinoline, 106.4 gm. (0.50 mole) of sodium metaperiodate, 2000 ml. of dioxane and 570 ml. of water is heated under a nitrogen atmosphere at 60 C. for 20 hours and poured into water. This mixture is extracted with chloroform. The chloroform extract is washed with water, dried over magnesium sulfate and concentrated in vacuo. The residue is chromatographed on 3.5 kg. of silica gel with 75% ethyl acetate-25% cyclohexane (by volume); 250-ml. fractions are collected. The material eluted in fractions 60-90 is crystallized from ethyl acetate to give 25.6 gm. (46% yield) of crude product. This product is recrystallized from ethyl acetate to yield 1-acetyl-8-benzoyl-1,2,3,4-tetrahydroquinoline, melting point 132-133-5 C.

Analysis.Calcd. for C N NO (Percent): C, 77.39; H, 6.13; N, 5.01. Found (percent): C, 77.47; H, 6.46; N, 4.95.

Using the procedure of Example 1, but replacing 5,6- dihydro-2-methyl-1-phenyl 4H pyrrolo[3,2,1-ij]quinoline by the appropriately substituted 5,6-dihydro-2-methyl-1-phenyl-4H-pyrrolo[3,2,1-ij']quinoline is productive of the corresponding 1 acetyl-8-benzoyl-1,2,3,4-tetrahydroquinoline. Representative of the 1-acetyl-8-benzoyl-1,2,3, 4-tetrahydroquinolines so obtained are:

1-acetyl-8-benzoyl-6-methyl- 1-acety1-8-benzoyl-6-ethyll-acetyl-8-benzoyl-6-methoxy- 1-acetyl-8-benzoyl-6-ethoxyl-acetyl-8-benzoyl-6-chloroand 1-acetyl-8-benzoyl-6-bromo-1,2,3,4-tetrahydroquinoline.

EXAMPLE 2 8-benzoyl-1,2,3,4-tetrahydroquinoline A stirred mixture of 23.4 gm. (0.0837 mole) of 1- acetyl-8-benzoyl 1,2,3,4 tetrahydroquinoline (Example 1), 595 ml. of ethanol and 300 ml. of 6 N hydrochloric acid is refluxed for hours and allowed to stand at ambient temperature for 18 hours. This mixture is concentrated to about 300 ml. under reduced pressure and poured into water. This solution is cooled in an ice bath, made alkaline with sodium hydroxide and extracted with ether. The ether extract is dried over anhydrous potassium carbonate and concentrated under reduced pressure. The residue is crystallized from petroleum ether to give 17.6 gm. (88.9% yield) of crude product. This product is recrystallized from petroleum ether to yield 8-benzoyl-1,2, 3,4-tetrahydroquinoline, melting point 68-69.5 C.

Analysis.--Calcd. for C H NO (percent): C, 80.98; H, 6.37; N, 5.90. Found (percent): C, 81.05; H, 6.77; N, 5.88.

Using the procedure of Example 2, but replacing l-acetyl-8-benzoyl-1,2,3,4-tetrahydroquinoline by the appropriately substituted 1 acetyl-8-benzoyl-1,2,3,4-tetrahydroquinoline is productive of the corresponding 8-benzoyl- 1,2,3,4-tetrahydroquinoline. Representative of the 8-benzoyl-1,2,3,4-tetrahydroquinolines so obtained are:

8-benzoyl-6-methyl- 8-benzoyl-6-ethyl- 8-benzoyl-6-methoxy- 8-benzoyl-6-ethoxy- 8-benzoyl-6-chloroand 8 benzoy1-6-bromo-1,2,3,4-tetrahydroquino1ine.

6 EXAMPLE 3 8-benzoyl-l-bromoacetyl-l,2,3,4-tetrahydroquinoline A stirred solution of 1.0 gm. (4.22 millimoles) of 8- benzoyl-1,2,3,4-tetrahydroquinoline (Example 2) and 0.4

ml. of pyridine in ml. of ether is treated with 1.02

gm. (5.06 millimoles) of bromoacetyl bromide and kept at ambient temperature for 2.5 hours. The ether solution is then washed with water, dried over potassium carbonate and concentrated in vacuo. The residue is chromatographed on gm. of silica gel with 40 ethyl acetate- 60% cyclohexane (by volume); 40-m1. fractions are collected. The product, 8-benzoyl-l-bromoacetyl-l,2,3,4-tetrahydroquinoline (0.525 gm.) in the form of an oil, is eluted in fractions 5-10.

Using the procedure of Example 3, but replacing 8-benzoyl-1,2,3,4-tetrahydroquinoline by the appropriately substituted 8-benzoyl-l,2,3,4-tetrahydroquinoline is productive of the corresponding 8-benzoyl-1-bromoacetyl-1,2,3,4- tetrahydroquinoline. Representative of the 8-benzoyl-1- bromoacetyl-1,2,3,4-tetrahydroquinolines so obtained are:

I claim: 1. The compound of the formula and its addition salts with pharmacologically acceptable acids.

References Cited UNITED STATES PATENTS 2,605,208 7/1952 Bartlett 260-287 R 3,651,083 3/ 1972 Hester 260-326.5 B 3,642,820 2/ 1972 Hester 260326.5 B

DONALD G. DAUS, Primary Examiner US. Cl. X.R. 260289 R, 287 R UNITED STATES PATENT OFFICE CERTIFICATE OF CQRRECTION patent um 5,793,3 I Dated February 19, 1974 Inv nt0 JacksonB. Hester. Jr.

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby eorrected as shown below:

Col umn 2, l i ne .7, formula IV should appear as shown below i nste ad of as shown in the patent J I IV N0 Column 2 line 18 "NalD should read NaIO line Step Step 5 57, arrow from formula I I0 to I should go from fromula .llb to l. Column 3, line 35, "[3.2,1-" should read 12,1-

\ Column 4, line 63, "106.4" should read 1O .5". Column 6,

line 11 "40" should read 40% v Signed and sealed this 10th day of September 197k.

(SEAL) Attest: v

MCCOY M. GIBSON, JR. c. MARSHALL DANN Attesting Officer Commissioner of Patents FORM PO-1050 (10-69) uscouu-oc wan-ale i 0.5. VIIIIKIY Fill". WICI: I. 0 IC-W 

